<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <h2>前端开发常用技术</h2>
    <ul>
      <li>HTML</li>
      <li>CSS3</li>
      <li>JavaScript</li>
      <li>jQuery</li>
      <li>Vue</li>
    </ul>
    <script src="js/jquery-3.6.0.js"></script>
    <script>
      $(document).ready(function () {
        $("h2").hover(
          function () {
            $(this).next().show(600);
          },
          function () {
            $(this).next().hide(200);
          }
        );
      });
    </script>
  </body>
</html>
